Sachusetts



Nov; 9 1925; Re, 16,467 I c. A. FRIEDRICH SOCKET FOR VACUUM TUBES OR THE LIKE Original Filed Dec. 9. 1921 Fig. 2- v INVENTOR- Cbak1esA.F iedrich, v

ATTORNEY is quite possible Reissued 7 Nov. 9, 1926 UNITED STATES CHARLES A. FRIEDRICH, OF

ssonusn'rrs.

PATENT OFFICE.

A CORPORATION OF MAS- SOCKET ronvaouum 'runns Dame LIKE.

Original No. 1,505,329, dated August 19, 1924, Serial No. 521,083,'fl1ed December, 9, 1921. Application for reissue filed August 13, 1926. Serial No. 129,063.

The present invention relates to electric sockets particularly for vacuum tubes used in electric wireless apparatus.

It is well known that the transmission of outside vibrations through the tube socket to the vacuum tube in radio transmitting and receiving devices is very detrimental to the proper, functioning of such tubes. If these vibrations are of large amplitude, it that the electrodes in the tube may be thrown together, causing short circuits and probably burn-outs of the tube filament or of its associated apparatus.

Also, these vibrations, by periodically displacing the elements, change the characteristics of the tube, thus causing modulations in such devices as are used for radio frequency', and direct changes of anode current in those used at audio. frequencies, either of which phenomena result in the conversion of mechanical vibrations into audio frequency currents in the output of the system.

Various devices have been constructed to absorb such outside vibrations and shocks but most of such devices are too cumbersome and not sufiiciently sensitive, Besides. such devices require too much valuable space in wireless apparatus.

In order to overcome these inconveniences, inefliciencies and drawbacks, I have constructed a novel vacuum tube socket which is equipped with means for absorbing outside vibrations, shocks, etc., and which is adapted to occupy comparatively small space.

With this object in view, my invention f -detr men'ta'l eflect we have, avoided in the 7 following manner.

consists in that, contrary to the existing sockets in which th tube is held substantially non-yielding in the socket, my new socket is provided with shock absorbed combined contacting and holding means which will support the tube so as to hold it yieldingly and out of physical contact with the socket proper, these means largely preventing transmission of mechanical vibration to the tube andits'element's.

My invention will stood by; reference to the accompanying drawing inwhich similar referenw characters denote corresponding parts and the insuiation stem be more fully-underwhich, Fig. 1 is an elevation of a vacuum tube equipped with my novel socket; Fig. 2is an enlarged top plan view ofthe socket proper; Fig. 3 is an enlarged vertical sectional view of onepartof the socket; Fig. 4 is a plan view and section of one of the socket members. I

Referring to the drawing more in. detail 0; denotes the bulb ordinarily called the vacuum tube and generally usedv in wireless systems for receiving or sending urposes. In 'this tube P denotes the so-cal ed plate made in form of a sleeve which'encloses the grid G and filament F, the rid, filament and plate being insulated another and conductively connected to the leads F, F G and Pg which pass through to the contact pins or from the base or sleeve wires, W, leading prongs C projecting a of the tube. I

In previous constructions of sockets for vacuum tubes, the electric connections be tween the terminal prongs of the vacuum tube and its associated apparatus have been effected by means of Such The base 10 according to this invent-ion, comprises a disk of insulation material hollow as .at 10 and open at its bottom and which is formed in its top with a plurality of erforations 10. At its bottom the disk ormed with radial grooves 10 through BELLEBOSE, NEW YORK,-ASSIGNOR TO ALDEN MANUFAG- and connect with a socketenclosing the base of the tube, said socket beingprovided make which extend metal arms -11 forming the v terminals for the 'elcctricwrres (not shown) These .arms are held in position by screw bolts 12 fixed in the disk. There are as many perforations as'there are prongs or and pins C, thus in the present case four,

the same arranged to register ;Wltl1- and made somewhat Wider than the diameter of said prongs, so that the latter may freely pass througl'i said perforations.

Arranged in the hollow 10 are the contact shoes 18 made according to the strucshoes 14 are-displaced'radially away from in the manufacture or to having been accidentally bent.

the center of the. socket thus bending the spring 15 which in turn applies-forces to the socket pins C. The vacuum tube Wllllltttlrally assume a position-in which the summation of these forces is equal to zero and when this position is assumed the-tube Will bev held free and clear and movable nniversally in all directions from the base 10.

Owing to the flexible support of the con tact members such as the shoes 18 the engagement of'the prongs C therewith will be ensured even though the latter may be of improper spacing or size due to some fault The base a is usually provided with a pin or projection K. This pin is utilized'in the present construction of the socket .to facili tate the positioning of the vacuum tube relative to the socket 10. Onthe upper face of the socket an arrow (see F ig'. 2) is marked indicating the osition of the pin K when inserting the tube, so that the Wires may be properly connected to the 1 corresponding electrodes. The latter may be marked, as shown, on the disk opposite the terminals.

The top' of the insulating disk 10 serves as a positive stop for the base a of the vacuum 'tube incase the contacts fail to limit the insertion of the prongs. The said top plate also serves to limit the lateral tilting action of the tube either by-the engagement of the prongs C with the sides of the prong openings 10 or by the engagement of the base a of the tube with the outer edge of the insulating disk. The insulating top piece with the holes 10 also serves as a guide for the ,from the principle of my invention.

prongs or pins C when inserting the same to the contacts and prevents undue twisting of the tube and contacts.

There may be other modifications made by those skilled in the art Without departing therefore, do not Wish'to restrict myself to the details shown and described.

The invention is broadly claimed in my concurrent reissue application No. 129,061.

I cla1m:--

v 1. A shock absorbing socket for vacuum tubes having projecting prongs comprising .an insulating base, a plurality of metallic arms secured to said base and arranged spaced apartcircumferentially andinsulated different prongs,

by each of said arms, and a contact carried by each spring upright, said contacts being movable independently of each other so that they can accommodate themselves to variousand positions of prongs and all of said contacts and their supporting uprights being movable angularly together to a limited extent when the prongs of a. vacuum tube. are held by said contacts. I i

2. A socket-for vacuum tubes having projecting prongscomprising in combination an insulating member, four independent electric conductor elements insulated from each other, each of said elements having a flat arm portion secured to said insulating member in a plane substantially parallclto the bottom otsaid'member and each of said elements having an upright spring port on terminating in a contact piece at an angle to. the arm portion and movable independently thereof and adapted to engage the side of one prong of aftube and so that When a tube is inserted said four contact piecesexert a relatively strong contact pressure on the sides of the tube prongs, and an insulating I top having perforatiohs to receive the prongs ot' the tube and serving as a guide an insulating base, terminals secured thereto,

a socket for connecting each prong to a ter minal, each socket including -a spring arm. portion and a resilient. contact member yield able independently toaccommodate itself to said sockets all being re-. siliently movable together when the prongs ot" a vacuum tube are inserted.

4.. A shock absorbing socket for vacuum tubes ha ving projecting prongs, comprising an insulating base having apertures registering wi h said prongs, the Walls of said apertures 'iunctioning as 'a stop to. limit twisting of said tube, terminals secured to said base :1 contacting member for connecting each prong to a terminal, each contacting-member including a spring arm portion and a resilient contact member yieldable independently to accommodate itself to ditl'erent including a spring arm portion and are silient contact member yieldable independently to accommodate itself to different z '5. projecting prongs,

prongs, said contacting members being resiliently movable when the. prongs of the vacuum tube are inserted, I

6. In a socket for a vacuum tube ha\-'ing an insulating base, terminal members fixed nected to saidterminal member's, contacting I shoes hinged to the upper end of said spring members and adapted to engage said prongs so as to support the vacuum tube out of physical contact with said base and means orlimiting'gthe extent to which the prongs.

of a tube can be inserted. v .7 :In a socket for a vacuum tube. having projectin prongs, an insulating base having four per orations in its top arranged to receive the-tour prongs of the tube, terminal members below said perforations, universal- 1y yielding spring members supported vertically by said terminal members, contacting shoes hmgedto the tops of said spring members, registering with said perforations and radapted to engage said pr'ongsso as to sup- .port the vacuum tube out of physical contact with saidbase and means for limiting vthe angular displacement of the vacuum .tube when insertedflin said socket. v -8. A vacuum tube socket comprising an insulating base, more than two conducting fmembers secured to said ---base and spaced apart circumferentially thereof and insu lated'from each other, each conducting memher having tact portion for yieldingly supporting a tube out of contact with the base, the'spring arm portions of said conducting members pressing radially of the socket to apply a binding force .upon the prongs of the-lube without tending torotate the tube.

; 9. A vacuumjtube socket comprising an insulating base, conducting members secured to said base and spaced apartcircumferen- Y tia-lly thereof: and insulated from each other, each conducting member-having a spring I arm portion and a contact portion for yleld- ..ingly supporting a tube, atop piece having ,per-forations to admit the prongs ofa tube to engage said contact members, the spring arm portions I all pressing radially of the socket to apply a binding force upon the prongs of the tube to said base, universally, yielding spring members conductlvely cona'spring arm portion anda' con-' all of said conducting-.members' through the top!- without tending to piece servlng as a stop to'limit the insertion of the tube prongs. I

tubes having projecting prongs'comprising aninsulating base. -four conducfing members, each conducting member consisting of an anchorage portion, a. contact portion. an a spring arm portion secured thereto foryieldingly supporting the tube, the contact portion and arm of each member being rotate the tube, said top yieldablefl independently of the others to ac-- commodate themselves to different prongs and difierentspacings'of prongs, and all being resiliently movable together when the prongs of avacuum tube are in place, said contacts pressing against the side-s ot the prongs to holdthem in place.

umtubes having four, projecting prongs,

the walls of said apertures functioning as a stop to limit movement of said tube, con- 1 11. A shock absorbing socket for vaccuducting members secured to said base and having terminals and contacting members for connecting the prongs to the terminals, each contacting member including a spring arm portion anda resilient contact member yieldable laterally and independently of the i to different sizes of others to accommodate it prongs, all'of said contacting members being resiliently movable together when the prongs of a vacuum tube are in place.

- 12. A shock absorbing socket for vacuum i tubes'having projecting prongs comprising an msulating base with a perforated top and having a recess, said base and top.form-.

depth of insertionofi ing a stoplimitingthe the tube and also limitingthe tilting of the tube after the insertion,

cess for connecting each prong to a terminal,

arm portionand a resilient contact member terminals securedto the base, a contactmg member lnsaid reyieldable laterally independently to adapt it tothe side of a tube prong, said contacting members being reslliently'movable when the prongs of the vacuum tube CHARLESA. FRIEDRICH,

are inserted 55 10. A shock absorbing socket for vacuum I 

